Modeling the fragmentation of rock grains using computed tomography and combined FDEM

Ma, Gang; Zhou, Wei; Regueiro, Richard A.; Wang, Qiao; Chang, Xiaolin

doi:10.1016/j.powtec.2016.11.046

Cited by 110 publications

(38 citation statements)

References 66 publications

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“…The micro-and mesoscale information can help understand the underlying mechanisms behind macroscopic observations and incorporate more physics in constitutive modeling. The microscopic scale investigations focus on individual particle kinematics and contact dynamics, in some cases particle breakage is considered (Ma et al, 2014(Ma et al, , 2017Yin et al, 2016;Zhou et al, 2015); while at the mesoscopic scale, structural features are accounted for with clusters of a few particles such as force chains and grain loops (in 2D) (Tordesillas et al, 2010;Zhu et al, 2016b). These two types of mesostructures can stand as the dual characteristics of granular contact systems (Radjai et al, 1996(Radjai et al, , 1998.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic softening in granular materials from a mesoscale perspective

Liu

Wautier

Bonelli

et al. 2020

International Journal of Solids and Structures

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Stress-oftening is one of the significant features experienced by cohesive-frictional granular materials subjected to deviatoric loading. This paper focuses on mesoscopic evolutions of the dense granular assembly during a typical drained biaxial test conducted by DEM, and proposes mesoscopically-based framework to interpret both hardening and softening mechanisms. In this context, force chains play a fundamental role as they form the strong contact phase in granular materials. Their geometrical and mechanical characteristics, as well as the surrounding structures, are defined and analyzed in terms of force chain bending evolution, local dilatancy, rotation and non coaxiality between the principal stress and the geometrical orientation of force chains. By distinguishing two zones inside and outside shear band, force chain rotations are shown to be of opposite sign, which may contribute to the observed macroscopic softening as one of the origin of the structural softening.

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Section: Introductionmentioning

confidence: 99%

Macroscopic softening in granular materials from a mesoscale perspective

Liu

Wautier

Bonelli

et al. 2020

International Journal of Solids and Structures

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“…Our data show that the coarse tail can tend towards linear in log–log space (e.g. Ma and others, 2017), but linearity is not a guarantee of power-law behaviour. The Rosin–Rammler distribution is also expected to describe grain size for grains that break according to the Weibull modulus of failure strength (e.g.…”

Section: Discussionmentioning

confidence: 63%

Characterization of glacial silt and clay using automated mineralogy

2019

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Glacial erosion produces vast quantities of fine-grained sediment that has a far-reaching impact on Earth surface processes. To gain a better understanding of the production of glacial silt and clay, we use automated mineralogy to quantify the microstructure and mineralogy of rock and sediment samples from 20 basins in the St. Elias Mountains, Yukon, Canada. Sediments were collected from proglacial streams, while rock samples were collected from ice marginal outcrops and fragmented using electrical pulse disaggregation. For both rock fragments and sediments, we observe a log-normal distribution of grain sizes and a sub-micrometer terminal grain size. We find that the abrasion of silt and clay results in both rounding and the exploitation of through-going fractures. The abundance of inter- versus intragranular fractures depends on mineralogy and size. Unlike the relatively larger grains, where crushing and abrasion are thought to exploit and produce discrete populations of grain sizes, the comminution of fines leads to a grain size, composition and rounding that is continuously distributed across size, and highly dependent on source-rock properties.

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“…Different ways to measure its evolution have been suggested (e.g., Marsal, 1967;Hardin, 1985;Einav, 2007). The effect of particle crushing on various physical and mechanical properties has been investigated (e.g., McDowell et al, 1996;Bandini and Coop, 2011;Zhang et al, 2018), and introduced into constitutive and numerical modelling (e.g., Ma et al, 2017;Zhou, 2017).…”

Section: Introductionmentioning

confidence: 99%

Relating fragmentation, plastic work and critical state in crushable rock clasts

Yin

Scaringi

et al. 2018

Engineering Geology

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Grain breakage during compression and shearing is one important mechanism responsible for irrecoverable changes of the mechanical properties of granular materials. Here we present results of triaxial tests on limestone fragments under some monotonic and cyclic stress paths and we investigate the relationships between the progression of grain breakage, the plastic work and the evolution of the critical state line. Using the plastic work concept, we propose a method for determining grain shape and grain breakage indices, and we show how grain breakage influences the critical stress state, and hence the mechanical behavio ur. The validity of the relationships is then verified on different granular assemblies (granite fragments and quartz sands), although further tests remain necessary to validate them under more generic stress paths.

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Modeling the fragmentation of rock grains using computed tomography and combined FDEM

Cited by 110 publications

References 66 publications

Macroscopic softening in granular materials from a mesoscale perspective

Macroscopic softening in granular materials from a mesoscale perspective

Characterization of glacial silt and clay using automated mineralogy

Relating fragmentation, plastic work and critical state in crushable rock clasts

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